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Leaf and stem diseases - viruses<br />
Barley Yellow Dwarf Virus<br />
Severity Barley yellow dwarf virus (BYDV) is prevalent in high rainfall areas.<br />
Aphids introduce and spread the virus in the crop.<br />
Source and spread Volunteers, spread by aphids.<br />
Main hosts All cereals, many grass weeds.<br />
Plant part attacked Leaves.<br />
Symptoms Yellowing of leaves begins at the tips, yellow stripes extend to the base,<br />
and leaves turn red.<br />
Symptoms may not be evident until sometime after the initial infection.<br />
More commonly seen in patches, especially at paddock margins.<br />
Early infection results in dwarfing of the plant and sterile panicles.<br />
Control methods<br />
rotations & Sow resistant or tolerant varieties.<br />
variety choice<br />
time of sowing Avoid early growth coinciding with periods of peak aphid activity.<br />
weed control Tillage, grazing and chemical controls of weeds and volunteers over<br />
summer to reduce aphid build up.<br />
control of insects Chemical control of aphids.<br />
Other comments Disease transmitted by aphids.<br />
More prevalent following an early break in the season.<br />
Can be confused with nutrient deficiencies, red leather leaf<br />
and waterlogging.<br />
32 PRODUCING QUALITY OAT HAY
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